CD Calculator
Estimate how much a certificate of deposit may be worth at maturity. Enter your initial deposit, advertised APY, and CD term to calculate the projected ending balance and total interest earned.
- Term in Years
- 3
- Growth Factor
- 1.141
- Interest Earned
- $1,411.66
- Average Interest per Year
- $470.55
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The main result is the estimated balance available when the CD reaches maturity, assuming the advertised APY remains applicable for the full term and all earned interest remains in the account. The calculation also shows the estimated interest earned above the original deposit.
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How to Use This Calculator
Enter your initial deposit, the CD's advertised annual percentage yield (APY), and the term in months. The calculator will estimate your balance at maturity and total interest earned. Use the APY shown in the bank or credit union's account disclosure rather than a nominal interest rate.
Formula & Methodology
The calculator treats APY as the effective annual yield, which already includes the effect of compounding. Maturity balance = initial deposit × (1 + APY ÷ 100)^(term in months ÷ 12). Interest earned equals the maturity balance minus the initial deposit.
Example: $10,000 CD at 4.50% APY for 36 months
For an initial deposit of $10,000, an APY of 4.50%, and a 36-month term, the estimated maturity balance is $11,411.66. The estimated interest earned is $1,411.66.
This calculator assumes a fixed APY, no withdrawals, no additional deposits, and that all interest remains in the CD until maturity. Actual results may differ because of day-count conventions, account opening dates, interest-crediting rules, rounding, minimum balance requirements, callable or variable-rate terms, taxes, and institution-specific policies. It does not calculate early withdrawal penalties because those penalties vary by institution and account agreement.
This calculator provides an estimate for informational and comparison purposes only. It is not financial, tax, or investment advice and does not represent a bank quote. Review the institution's account disclosure, maturity terms, renewal policy, and early withdrawal penalty before opening or withdrawing from a certificate of deposit.
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Frequently Asked Questions
- How is CD interest calculated?
- CD earnings depend on the initial deposit, annual percentage yield, and term. This calculator applies the advertised APY over the selected fraction of a year and assumes the interest remains in the account until maturity.
- What is the difference between APY and an interest rate?
- An interest rate is the nominal rate used to calculate periodic interest. APY represents the effective annual yield after accounting for compounding, making it more useful when comparing deposit products.
- Does APY already include compound interest?
- Yes. APY is designed to reflect the total annual yield after accounting for the interest rate and compounding. That is why this calculator does not ask for a separate compounding frequency.
- Can I withdraw money before a CD matures?
- Many institutions allow early withdrawal, but they commonly charge a penalty. The amount may depend on the CD term, withdrawal timing, and account agreement.
- Does this calculator include early withdrawal penalties?
- No. Early withdrawal penalties vary by institution and product, so the calculator estimates the value at normal maturity without an early withdrawal.
- Are taxes deducted from the result?
- No. The result is a pre-tax estimate. Tax treatment depends on your circumstances and applicable tax rules.
- What happens when a CD reaches maturity?
- Depending on the account agreement, you may be able to withdraw the balance, transfer it, or renew the CD. Some institutions automatically renew CDs unless instructions are provided during a grace period.
- Why might the bank's result differ from this estimate?
- Differences may result from exact opening and maturity dates, daily balance calculations, rounding, interest-crediting schedules, minimum balance rules, or other institution-specific terms.
Last updated 7/15/2026